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Harness Engineering - Part 7: The Memory Layer

Welcome back to the Harness Engineering series — a 10-part journey from raw language model to production-ready agentic system. Made by builders. For builders.

  • Short-term memory includes conversation history and tool results during a single session.
  • Long-term memory persists across multiple sessions, storing past decisions and user preferences.

Network Troubleshooting as a Stack: Find Which Layer Is Broken First

The difference between a good infrastructure troubleshooter and someone who restarts services and hopes is a mental model.

  • Network operates as a stack: Application, TLS, Port, DNS, Gateway, Route, Interface
  • Start troubleshooting from Interface layer by checking link and IP address
  • Use specific commands (ip addr show, ip route get, ping, dig, nc, openssl, curl) to test each layer

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